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/*-
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: aout_freebsd.c,v 1.1.1.1 1998/08/21 03:17:41 msmith Exp $
*/
#include <sys/param.h>
#include <sys/exec.h>
#include <sys/imgact_aout.h>
#include <sys/reboot.h>
#include <string.h>
#include <machine/bootinfo.h>
#include <stand.h>
#include "bootstrap.h"
static int aout_loadimage(int fd, vm_offset_t loadaddr, struct exec *ehdr);
char *aout_kerneltype = "a.out kernel";
char *aout_moduletype = "a.out module";
/*
* Attempt to load the file (file) as an a.out module. It will be stored at
* (dest), and a pointer to a module structure describing the loaded object
* will be saved in (result).
*/
int
aout_loadmodule(char *filename, vm_offset_t dest, struct loaded_module **result)
{
struct loaded_module *mp;
struct exec ehdr;
int fd;
vm_offset_t addr;
int err, kernel;
/*
* Open the image, read and validate the a.out header
*/
if (filename == NULL) /* can't handle nameless */
return(EFTYPE);
if ((fd = open(filename, O_RDONLY)) == -1)
return(errno);
if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
return(EFTYPE); /* could be EIO, but may be small file */
if (N_BADMAG(ehdr))
return(EFTYPE);
/*
* Check to see what sort of module we are.
*
* XXX should check N_GETMID()
*/
mp = mod_findmodule(NULL, NULL);
if (N_GETFLAG(ehdr) == (EX_DYNAMIC | EX_PIC)) {
/* Looks like a kld module */
if (mp == NULL) {
printf("aout_loadmodule: can't load module before kernel\n");
return(EPERM);
}
if (strcmp(aout_kerneltype, mp->m_type)) {
printf("out_loadmodule: can't load module with kernel type '%s'\n", mp->m_type);
return(EPERM);
}
/* Looks OK, got ahead */
kernel = 0;
} else if (N_GETFLAG(ehdr) == 0) {
/* Looks like a kernel */
if (mp != NULL) {
printf("aout_loadmodule: kernel already loaded\n");
return(EPERM);
}
/*
* Calculate destination address based on kernel entrypoint
* XXX this is i386-freebsd-aout specific
*/
dest = ehdr.a_entry & 0x100000;
if (dest == 0) {
printf("aout_loadmodule: not a kernel (maybe static binary?)\n");
return(EPERM);
}
kernel = 1;
} else {
return(EFTYPE);
}
/*
* Ok, we think we should handle this.
*/
mp = malloc(sizeof(struct loaded_module));
mp->m_name = strdup(filename); /* XXX should we prune the name? */
mp->m_type = strdup(kernel ? aout_kerneltype : aout_moduletype);
mp->m_args = NULL; /* XXX should we put the bootstrap args here and parse later? */
mp->m_metadata = NULL;
mp->m_addr = addr = dest;
printf("%s at 0x%x\n", filename, addr);
mp->m_size = aout_loadimage(fd, addr, &ehdr);
if (mp->m_size == 0)
goto ioerr;
/* save exec header as metadata */
mod_addmetadata(mp, MODINFOMD_AOUTEXEC, sizeof(struct exec), &ehdr);
/* Load OK, return module pointer */
*result = (struct loaded_module *)mp;
return(0);
ioerr:
err = EIO;
close(fd);
free(mp);
return(err);
}
/*
* With the file (fd) open on the image, and (ehdr) containing
* the exec header, load the image at (addr)
*
* Fixup the a_bss field in (ehdr) to reflect the padding added to
* align the symbol table.
*/
static int
aout_loadimage(int fd, vm_offset_t loadaddr, struct exec *ehdr)
{
u_int pad;
vm_offset_t addr;
int ss;
addr = loadaddr;
lseek(fd, N_TXTOFF(*ehdr), SEEK_SET);
/* text segment */
printf("text=0x%lx ", ehdr->a_text);
if (archsw.arch_readin(fd, addr, ehdr->a_text) != ehdr->a_text)
return(0);
addr += ehdr->a_text;
/* data segment */
printf("data=0x%lx ", ehdr->a_data);
if (archsw.arch_readin(fd, addr, ehdr->a_data) != ehdr->a_data)
return(0);
addr += ehdr->a_data;
/* skip the BSS */
printf("bss=0x%lx ", ehdr->a_bss);
addr += ehdr->a_bss;
/* pad to a page boundary */
pad = (u_int)addr & PAGE_MASK;
if (pad != 0) {
pad = PAGE_SIZE - pad;
addr += pad;
ehdr->a_bss += pad;
}
/* symbol table size */
archsw.arch_copyin(&ehdr->a_syms, addr, sizeof(ehdr->a_syms));
addr += sizeof(ehdr->a_syms);
/* symbol table */
printf("symbols=[0x%x+0x%x+0x%lx", pad, sizeof(ehdr->a_syms), ehdr->a_syms);
if (archsw.arch_readin(fd, addr, ehdr->a_syms) != ehdr->a_syms)
return(0);
addr += ehdr->a_syms;
/* string table */
read(fd, &ss, sizeof(ss));
archsw.arch_copyin(&ss, addr, sizeof(ss));
addr += sizeof(ss);
ss -= sizeof(ss);
printf("+0x%x+0x%x]", sizeof(ss), ss);
if (archsw.arch_readin(fd, addr, ss) != ss)
return(0);
printf(" \n");
addr += ss;
return(addr - loadaddr);
}
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